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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2018 Rockchip Electronics Co., Ltd
*/
#include <common.h>
#include <adc.h>
DECLARE_GLOBAL_DATA_PTR;
#define KEY_DOWN_MIN_VAL 0
#define KEY_DOWN_MAX_VAL 30
/*
* Two board variants whith adc channel 3 is for board id
* v10: 1024, v11: 512
* v10: adc channel 0 for dnl key
* v11: adc channel 1 for dnl key
*/
int rockchip_dnl_key_pressed(void)
{
unsigned int key_val, id_val;
int key_ch;
if (adc_channel_single_shot("saradc", 3, &id_val)) {
printf("%s read board id failed\n", __func__);
return false;
}
if (abs(id_val - 1024) <= 30)
key_ch = 0;
else
key_ch = 1;
if (adc_channel_single_shot("saradc", key_ch, &key_val)) {
printf("%s read adc key val failed\n", __func__);
return false;
}
if (key_val >= KEY_DOWN_MIN_VAL && key_val <= KEY_DOWN_MAX_VAL)
return true;
else
return false;
}
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